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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad75ea95fae109a117e59375c65c18f8038d8868982bb954d941a20ee8462587' 
  AND token = 'N2DK0aFscHa2dWByxc9/Lfy2pZCYdN/pNwZ3tLBbjSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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