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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '577e2b153976aca9099d148ec00dfd3e624a2d6291da35c9dc2cd1b3da6cd7fe' 
  AND token = 'oWMx+WVhE47w0PcuqUDHSXyi9nH1l7hbBQQ1o8aWdsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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