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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c36d41d199152b5c61a9f9f2e1e5b0182dd3b7e9657f2fd0022f4371e110877' 
  AND token = 'K64oig3norDvdL7Z4xKFISVVZUb1f4Bhk8lIBCSEE2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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