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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b0079eec16927bc94d9ff0ec2867d173ee2671a842b2067cee27165c43ab603' 
  AND token = 'aeYVfTB5sMxV669JBw9jjo+oHCfBZyLfsuMDVAWJLyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00317

JSON explain

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