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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '196b79a10fef24ccdf5d6af3af58e97cdad3db40cec587d4162f6bd3c159ed51' 
  AND token = 'WSbV6Om1uTa2i/vRedMkqq0Ck4Ifs5gZ7L5r1cdCKpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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