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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8013482d6f9705f8b2393eb41e494185d5d0205aef69d08e4894291f2bbf05e' 
  AND token = 'nr6fnY4z3IREjTVd+Iui6SPweiJAQaaOtKoSEnR5scA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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