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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e339d98345d1e8d252c539166baae3257b4c0dfbea179a92bcf69a9cd80b7867' 
  AND token = '283zB5NlkF9sbFPKEKr0jVh4+WkJd9rMVxlA0kVtDIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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