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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a15162bc51e7db42eb27e6cc57222b82b7e94e25ef3e35a6dca0ca3d7113d21c' 
  AND token = 'DuRtLpKuFPdTUkzOiDycB797fGX1g45RDP6XQ5p+GyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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