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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5400f514f13f2ea36539768d9eb4781a5848222768e86f96b2fbc9bd45a6530d' 
  AND token = 'cl/ek/XpOb0pn/Dk8Pcq+tA0tMiqnsFcAQmxHCmJILs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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