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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2bee874a7c22e218139e6f8d60343982c48c99ac9bd3e182a4b4b0eace9de2fe' 
  AND token = 'lPrcIE61LzA/jdKw8VASJqlTjy0qru1KiT1Mrn+R8XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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