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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '435cd407436a08f30a8944869468d732850b3012a78333e70e17a4c6ab277c6d' 
  AND token = 'CLWWKDSVohUoWWa0nDDR9oy4pRDNx6T26rmC+NsNQYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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