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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc293bfe9f72bd288a30091ebd8a90cdd6526d65077cedf47eb9a14b5068391a' 
  AND token = 'sBHEWMbtxLWK1r8VbNBNBoBWtVcFicR1wNFxtYU0O9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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