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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23deab25c5c1fe091d36bb4d0c3f37b43006aa063b2a9738a59ee29dc14f5345' 
  AND token = 'eNh+QsZh7vevrGMW0iR1orbA5bOM0K4cCGeqhQV9FX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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