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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47781f62c26f782ea8076d9acffe0b0f936ee4868aa7eff928918b2802ed33e4' 
  AND token = 'zdDHeC4pyBbyEUxLhNun/ahM05zu9RfRthPxd0PO7Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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