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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b947155ea7e47a9791e8d52a857fa1e02d08ae0a8af58dd1fc29adb70496e5b0' 
  AND token = 'UBCFQmPSey3vJtJwBQLiyUOLTWLjJXkC3eke9yP1wYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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