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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21bac09fbcf50be063c1d98403bb3344da9ffb31bc16f8a8595d6c41f47cfa73' 
  AND token = 'jri97M1aAerFJsL9eVD/BaNeF0VW0MgZ93Jvejhrj70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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