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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '945b3f56b5c366c95ce4155e5a155eae4b62c369612b578b89d5d40b7c44cc0c' 
  AND token = 'P6OT190X3s3iTxRIY4llxTFwYySZzxRNm0P61j2Dgro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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