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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '709319479a605684595018a6d8c772b5967c557d0b4f57b2b1a7ecdb3572601d' 
  AND token = 'BV9ZgQENGQ0qbmCqjEOy7HlVup77wRScX/NiV6rQuSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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