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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0e7fc3acd0c70b3307c40da0ea5a2f47f1ad6507093611bd2fbde98074d72c9' 
  AND token = 'wnKNMLWYk3+P/Miggj3fbnEu90Bm+kQLrVX0pKSC/ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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