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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67a027e265c8bd30eef7f0bfa4e1c589f2796b18c165e8ae5db5259c8eea1312' 
  AND token = 'nh9S/H8JGJ5vjkwbVi5VePw4JF2eySP6eXs4JvnFAV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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