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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7eacbbe2ab2003dfb74f9cd43c912d37d98bc244cd908fd22fe7e80f9157b0c4' 
  AND token = 'lHiW75gbaaH4dRyjloFTSRDP98WK4YZU1kSgY898kSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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