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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7f20dfc7e9f54ec55a2aba587adc09e75031cc06ea57644e0b0faf0e12e37d5' 
  AND token = 'Wte7+/ggsZ/4MPiZY8oROZ3QMZmCU/bka2h6DGKOz90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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