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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b69c6a61abc7c05d2ce4c421072a95b96cdc67b00ddf15d4b2aeb7001d25658f' 
  AND token = '1/ZP6i8iE4L0u4p7/NIxy12/Vwnhqt6Pj69PKD2n49A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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