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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f39465ba60175ae569bc159decdf7878040a7ce6a803b4b855e49b3db54f4b48' 
  AND token = 'U/OvgvLuUcCYMLuSYX+o2Rx1gvn2IlTvhaOfDL3eus8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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