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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45f25fd4e228ccced025626316a84409e20e47e133c4c0d26ee514f7372e7e2c' 
  AND token = 'iOEBHQ1UjWekK62FxaxS+GwsOAo3+/x3xo1faVrw6Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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