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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57386ece39093854f8ee098eef8e759d7af3e72a537cc6b569ab90a752644c47' 
  AND token = '9dYwvMnrVLNRX1JBR00uOXk3AL64+bS2vOLNqJMuo9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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