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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fbe4d70b0a3037a6cc78bce4d0597c01552c68de696f2ebed3d462e0618b63b' 
  AND token = '/AQ6O/bDqxi2B7KC3mX5llpdk41BsJEgEUF1gnRbj7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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