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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95f86d3c243a935bf668895d29dd41a3bcdfab172461a7a931879e4cc0c6881e' 
  AND token = 'BfiNrmMahkKy9dUEVUrOJ/MNDpFcjK6bjFnyJM8hURk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}