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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a7641cf1bb72bbcfc35042befa604b7e8882786675e4b882b29232e2232c9a0' 
  AND token = 'ox1fKYO4IPmAXA+K/6AQVwbJEuuiRwQ2o9SSIRlG2+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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