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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f2a0c0b649e86ae74bfd69f98fa0a0bd6190f68c52d1dae21dc44690730bea2' 
  AND token = 't6rMwW+I7k2gib/zuutYUts8ZMux8RYJPLBbOYCjNc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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