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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c17b9f33ecb60aab44b413ecb68f2da298398ba8fef1568a47fbb431fd0884a2' 
  AND token = 'N3zQSr0wdgexuzRdgKffWSWTdBqZ7k0myU82r98eU4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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