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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f484150c96ef05820ec698d28cda4d9a98de95fcc79a092433e7f8ee0bb5e5e' 
  AND token = 'DIK0zSebCLFoPCg5L4VXwT1AFdT1UBaIlV9pGz/4lpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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