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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9f5e7f11871b1af69bde68b35f065f67847b2abf685ae5a1e76a8c55062b904' 
  AND token = 'JIB8PreSavGBLR4r6n1Z13jVBWdw9rgj4afTeN6DsYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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