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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc7ee09496514fe9218977deebbdd3ba2db80dde6f8edb7309cd564f19c75515' 
  AND token = 'UoVNiueFIN8nbgiHxFnC4JBpM/dRcO8g2HZ5yGLGicE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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