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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b22a2ce991e4a54faf3a3731d8d103a7724489bad5b2896b56edc805a452622a' 
  AND token = 'l5bQTm3LSUTTVAN95yOnnIBMogZw11s9XiSe7L6swY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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