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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '763755887ab1cbe1c685c26dd6f4dd0ca5900ddd7028cd86f74d930f27b6f4ff' 
  AND token = 'mhouBTzyDm6o6JJ+fmIzsSN1XdbMvxPmA9Winw51LMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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