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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdc857e62d0f94cea3cf4f8b17091840879e4ff4e55adab8184dc357b64a0470' 
  AND token = 'cVvhfgkDNy/rTrsvTop1uvNXTp3QuhmLz4RWFBNQel0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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