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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '532bd8447ee601a50f050a46d6c4b2691e2a71bfadd9747dfc09f31b43fda8a9' 
  AND token = 'a2o4OFEcFo8OVpm0XP1Fvs0toX3baDx7adAN4/SOW/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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