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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '587365dfb702b70fc0d69f6473c57a638f3bce04b9a7100def3824d98956fa3e' 
  AND token = 'xomLouXuzcux0yJlM//L1wc3fgkwfNJo9DIbfxC5NYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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