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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37b6e7763b8967b1a498781086a4bc993f6446ffef1984cf8147e67a0c7df87b' 
  AND token = 'biEljJjNWaw4YRILKnZdLUobl0DZCSt4TmAlA5dM2jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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