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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4181bd28be77eb2735cfa3ead66aeab378db952b51da948a5df7fe4f69fe443d' 
  AND token = '9zD1QRRE7NdZYBplnF4A+SqELY6XFOp7X3+DJWnJIlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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