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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a39a2d188e1cf4b6a93d1334b054f7b73028da5ed2fa7b7c78354b5f9834dd7a' 
  AND token = 'hLGamp7517skrMLP3LPrug/ZPS6u29o+0aFgsCO4o+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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