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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e906a8c1d38cc26ce44dd668be31364cd710d277147b05da781032f545ab4b81' 
  AND token = 'Utbgy13IwW6JeAtDeyjPnb99y4VN+EhyHDzo6e2pzNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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