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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89132dfa8cd94a95a93ae1dc43db5f7a50872f6a2271c92bd681881e251afc0b' 
  AND token = 'T0YV5ia+JjPG4Vgu4vXt7jPcTFtxM9pzrnda1cQMais=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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