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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4a0a7411a43eb138e973181aace0f2249ae49bb84938ec96e028194c980cb9d' 
  AND token = 'DR5G2uTe+6nk00RuKfhxZI3Wa7jbod/7BT9vbRpR/AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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