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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0be2339484d560d4bab5bff5cc72700e488b645d49aaec425b78758b0e092bfe' 
  AND token = 'EG0+Y+QsBUe9J637m5X7HUlYZKzsiYU3047b7VUtFw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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