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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9bac7800f9cc4c43d84bd27f5817e74e2b165e619fe9c7912fcf56ba1db3befd' 
  AND token = 'EUSEaPqYn7xJfgLlSRQ/9kKqfcUxSdYzFeNAeKV/x/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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