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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e47cff8245c3f12eccf61e4d73b4ce14b79344cffb009928fe81a92fa979d6b' 
  AND token = 'pMYbgq1NjdCwkNd4xIzoQ7pT1jPPxM1s0nTkhe9CoWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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