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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4784d6befda849c6ad1b2509f644e91ddb2f327392ede6a4e1d4e7f0f4cea0de' 
  AND token = 'x6kKdrwpVi/BuDmQkMSfJ0BIwlYJcLOtr8l/ujUp0dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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