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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4285922a7e5f51bf1ffb2beece5064a0dd551e2b35884ba1393c15a7c0159cb' 
  AND token = 'icvsk/JY5aBonVnEOAPym9fUMzcRKCJr/y8y4bcT1Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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