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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2e83001d53d6943d96fc0672f9b936b9c8ea83537f629988c9b36eff7c86f40' 
  AND token = 'Ba8FGgHit3iFZd3cwqAstuifIKkHuvrkVsKx3x86pZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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