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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '186c0f1f03d1bde0cb6546f4009862695e8d3f547b2b29fb67c849854ef8039a' 
  AND token = 'nbEyG9rwazqaiWPs1gswkMZQqbyX+0NlploNoX/a9lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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