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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '609ffd06693049c35adc0c96816352c0b522d7ac68ec13c7953498275c982a6a' 
  AND token = 'jqflhZZPFc/Ha59SXmPJTBFUyeFJA6f46cWY56Cahk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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