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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79bd77b8b47149d4aa4eb6770a4b3b18106d2f4d9c70230ebd446372aec7feee' 
  AND token = 'u6LpuW8OrrWTq1UZJQIv+GcXe+pjTS8kb1NRESWBpYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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